Apache MPM winnt

Summary

This Multi-Processing Module (MPM) is the default for the
Windows NT operating systems. It uses a single control process
which launches a single child process which in turn creates
threads to handle requests

AcceptEx() is a Microsoft WinSock v2 API that provides
some performance improvements over the use of the BSD style
accept() API in certain circumstances. Some popular Windows
products, typically virus scanning or virtual private network
packages, have bugs that interfere with the proper operation of
AcceptEx(). If you encounter an error condition like:

[error] (730038)An operation was attempted on something that is
not a socket.: winnt_accept: AcceptEx failed. Attempting to recover.